Motherboard is an Asus M5A99 FX Pro 2.0 running an AMD Phenom II X4 945 with 8 GB RAM.
Cloned the previous system drive using EaseUS's TODO Backup program following the instructions listed in PC Magazine's article "How to Copy your Windows Installation to an SSD."
302 GB of free space on the 500 GB SSD.
I have the same problem. at first I thought it was my board. But after changing back to another ssd or hdd it solved the issue. I am still wondering if this will be solved at all.